Someone suggests I add it to my directory of resources, which might be useful to searchers. I can't (yet) see value with this source; that's why I'm raising my question.

EU Business Services Ltd. P.O. Box 2021, Utrecht, The Netherlands --@----.com www.eubusinessregister.org

From the website:
If you are looking for clients, partners or colleagues in business within the EU

The EU Business Register is your primary source for finding businesses.
The EU Business Register, the place where YOUR company can be found.